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Imperial Mine (Helen Mine), Railroad Springs District, Esmeralda Co., Nevada, USA

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Lock Map
Latitude & Longitude (WGS84): 37° 33' 0'' North , 117° 31' 15'' West
Latitude & Longitude (decimal): 37.55018,-117.52107
GeoHash:G#: 9qsmtezc8
Locality type:Mine
Köppen climate type:BWk : Cold desert climate

This mine was active in the 1930's and had been freshly staked (for claim) in 1982.

Geology and mineralogy are likely to be similar to other mines in the district, especially the Big 3 Mine, Railroad Springs District (

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

4 valid minerals.

Detailed Mineral List:

Formula: Zn2(AsO4)(OH)
Reference: Weissman collection - visual ID based on similarity to Big 3 Mine
Formula: NdCu6(AsO4)3(OH)6 · 3H2O
Description: note - agardite-(Nd) and agardite-(Y) are visually similar, both are likely to occure at this locality, and on the same specimen, all specimens should be analyzed for confirmation
Reference: Dakota Matrix - Tom Loomis
Agardite-(Y) ?
Formula: YCu6(AsO4)3(OH)6 · 3H2O
Description: needs analysis, agardite-(Nd) and agardite-(Y) are visually similar
Reference: Weissman collection - visual ID based on similarity to Big 3 Mine
Formula: CaCu(AsO4)(OH)
Reference: Weissman collection - visual ID based on similarity to Big 3 Mine

List of minerals arranged by Strunz 10th Edition classification

Group 8 - Phosphates, Arsenates and Vanadates
'Agardite-(Nd)'8.DL.15NdCu6(AsO4)3(OH)6 · 3H2O
'Agardite-(Y)' ?8.DL.15YCu6(AsO4)3(OH)6 · 3H2O

List of minerals arranged by Dana 8th Edition classification

Agardite-(Y) ? · 3H2O
Unclassified Minerals, Rocks, etc.
Agardite-(Nd)-NdCu6(AsO4)3(OH)6 · 3H2O

List of minerals for each chemical element

H AdamiteZn2(AsO4)(OH)
H Agardite-(Nd)NdCu6(AsO4)3(OH)6 · 3H2O
H Agardite-(Y)YCu6(AsO4)3(OH)6 · 3H2O
H ConichalciteCaCu(AsO4)(OH)
O AdamiteZn2(AsO4)(OH)
O Agardite-(Nd)NdCu6(AsO4)3(OH)6 · 3H2O
O Agardite-(Y)YCu6(AsO4)3(OH)6 · 3H2O
O ConichalciteCaCu(AsO4)(OH)
Ca ConichalciteCaCu(AsO4)(OH)
Cu Agardite-(Nd)NdCu6(AsO4)3(OH)6 · 3H2O
Cu Agardite-(Y)YCu6(AsO4)3(OH)6 · 3H2O
Cu ConichalciteCaCu(AsO4)(OH)
Zn AdamiteZn2(AsO4)(OH)
As AdamiteZn2(AsO4)(OH)
As Agardite-(Nd)NdCu6(AsO4)3(OH)6 · 3H2O
As Agardite-(Y)YCu6(AsO4)3(OH)6 · 3H2O
As ConichalciteCaCu(AsO4)(OH)
Y Agardite-(Y)YCu6(AsO4)3(OH)6 · 3H2O
Nd Agardite-(Nd)NdCu6(AsO4)3(OH)6 · 3H2O

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on

2.588 - 23.03 Ma

ID: 3186305
Cenozoic volcanic rocks

Age: Neogene (2.588 - 23.03 Ma)

Stratigraphic Name: Columbia River Basalt

Comments: Columbia Plateau

Lithology: Flood basalt(s); mafic volcanic rocks; basalt

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Early Cambrian - Neoproterozoic
511 - 1000 Ma

ID: 3019726
Crossbedded quartzite, siltstone, and phyllite

Age: Neoproterozoic to Cambrian (511 - 1000 Ma)

Stratigraphic Name: Campito Formation; Deep Spring Formation; Harkless Formation; Poleta Formation; Reed Dolomite; Gold Hill Formation; Osgood Mountain Quartzite; Prospect Mountain Quartzite; Stirling Quartzite; Wood Canyon Formation; Zabriskie Quartzite

Description: These lowermost Cambrian to Precambrian strata are scattered over much of central and eastern Nevada and form the base of the Phanerozoic part of the continental margin stratigraphic section. They include the Campito, Deep Spring, Harkless, and Poleta Formations, and the Reed Dolomite in Esmeralda County; the Gold Hill Formation in northern Nye County; unnamed quartzite and shale in White Pine County; the Osgood Mountain quartzite in Humboldt County; the Prospect Mountain Quartzite in northern Nye, Lincoln, Eureka, and Elko Counties; unnamed quartzite and shale in Lander and Clark counties; and the Stirling Quartzite, Wood Canyon Formation, and Zabriskie Quartzite in southern Nye County. In a number of places, these rocks are depositional on Late Proterozoic unit Zqs. In southernmost Clark County, CZq is lying unconformably directly on Early Proterozoic gneiss (Xm). In the east-central part of Nevada, CZq is overlain depositionally by Cambrian carbonate (Cc) of the Carbonate shelf sequence. In the Nolan belt, these rocks are depositionally overlain by unit Ctd. In the Osgood Mountains in Humboldt County, Permian and Pennsylvanian rocks of the Siliciclastic overlap assemblage (PIPacl, Pacl) rest unconformably directly on the Osgood Mountain Quartzite.

Comments: Original map source: Crafford, A.E.J., 2007, Geologic Map of Nevada: U.S. Geological Survey Data Series 249, 1 CD-ROM, 46 p., 1 plate; Scale 1:250,000.

Lithology: Major:{quartzite,siltstone,phyllite}, Minor:{shale,dolostone}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by, used under Creative Commons Attribution 4.0 License


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Nevada Bureau of Mines and Geology (1983) A mineral inventory of the Esmeralda-Stateline resource area, Las Vegas District, Nevada. NBMG Open File Report 83-11: 137-138.

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